Milling machine



Dec. 19, 1933. MEHLHQPE 1,940,139

MILLING MACHINE Filed March 25, 1930 2 Sheets-Sheet l 43 211 L/NCOLN [5 MEHLHOPE mum Dec. 19, 1933. E. MEHLHQPE 1,940,139

MILLING MACHINE Filed March 25, 1930 2 Sheets-Sheet 2 L/NCOLN 5 MEHLHOPE '5 MAS/072,4

Patented Dec. 19, 1933 PATIENT OFFICE uiv rso *VSTATIYES 7 Claims. (or. 90-18} This invention relates to milling machines and more particularly to improvements in overarm structures for the same. It has been common practice to provide milling 5 machineswith' overarms having outboard bearings for cutter arbors and usually these overarms wereplaced substantially over the cutter arbors and. extended parallel therewith. Since they were of greater width than the cutter arbor, in- 1 terference would result with work pieces of considerable height and thus limit the capacity of the machine to a certain extent. Also', in duplex machlnesthat is,-in machines ha'vinga column on each side of thework table, the use of straight overarms-on each column resultedininterfe'rence so that only one could be used at a time. It is therefore an object of this invention to overcome theabove inadequacies of overarm structures, by providing an' overarm having an offset in it,"thus improving thestructure and intrative of one embodiment thereof, but it will be understood that any modifications may be made in the specific structural details hereinafter disclosed, within the scope of the appended claims, "without departing from or exceeding the spirit of the invention.

Figure 1 is a perspective view of a machine showing one embodiment of the invention;

Figure 2 is an elevation, partly in section, showing the relative positions of the overarms when overlapping.

Figure 3 is a section on line 33 of Figure 2 Figure 4 is a perspective view of another embodiment of the invention; 45 Figure 5 is a detailed view of an offset overarm;

Figure 6 is an end view on the line 6-6 of Figure 5; and

Figure '7 is a section on the line '7'7 of Figure 5.

Referring to the drawings, in which like reference numerals indicate like parts, reference numeral 10 in Figure 1 represents the base of a machine showing one form of the invention embodied therein; Upon opposite sides of the base 10 are the columns 11 and 12, column 11 having guideways 13, on which is slidably mounted the head 14 and the column 12 having guideways 15 on which 'isslidably mounted the head 16, said guideways lying substantially in a single plane. The head 14 is provided with a cutter spindle l7 journaled therein for rotating the cutter arbor 18 having thereon cutter 19. Adjustably mounted in guideways upon the top of the head 14, is the overarm 20 having the offset portion 21.'

The head 16 is provided with a cutter spindle 22 journaled therein for rotating cutter arbor 23 having mounted thereon the cutter 24. The head 16 is also provided with guideways in which is adjustably mounted the overarm 25. The overarm 25, which is in this case a straight overarm,

has adjustably mounted on the overhanging end thereof, the pendant 26 for supporting the outboard bearing 27 for the cutter arbor 23; Bearing 2'7 comprises the base 28, which is keyed to the vertical face 29 of the pendant 26 bythe key 30. i A cap 31 is provided for the bearing, and the bolts 32 and 33 threaded in the pendant-26 hold the cap and base of the bearing in position.. Bearing 2'7 is provided'with a bore 34, in which is mountedthe tapered sleeve 35 which is threaded on its smaller end for receiving the nut 36 which holds it in place. Aninner sleeve 37, having a bore 38 'for receiving the end of the arbor 23, is journaled in the sleeve 35; A large nut 39, threaded on the reduced end of the arbor 23, engages a shoulder 40 on the interior ofthe sleeve 37 to hold the parts in longitudinal position.

The overarm 20, as shown in Figures 5, 6 and 7, is provided with guide means 41, upon which is mounted, for longitudinal adjustment thereof, a gooseneck pendant 42. The overarm 20 is longitudinally adjustable in the head 14 by means of the conventional rack and gear as shown in Figure '7. The pendant 42 has a vertical face 43, upon which is mounted bearing 44 and clamped thereto in a manner similar to that for bearing 27. The use of the gooseneck pendant 42 in connection with the offset overarm, makes it possible to support the bearing 44 in longitudinal alignment with the arbor 18. With this arrangement of overarm on the two vertical sliding heads, it is possible to move the cutters as close together in overlapping relation as desired and at the same time provide an outboard support for the cutter arbors without one of the overarms interfering.

In Figure 4 there is shown a modification of an offset overarm having the portion 46 slidably mounted in column of the machine and adjusting'means therefor represented generally by the loo ing separable parts adapted to embrace the arbor handle 48. The overarm 46 has the offset portion 47 extending parallel with portion 46 and the arm 49 at right angles to the offset 47. The arm 49 is provided with the gui-deways 50, upon which is slidably mounted pendant 51. By this construction, in the saddle, table and knee type of milling machine, it is possible to bring work of considerable height into contact with the cutter without interference of an overarm directly over the cutter spindle.

What is claimed is:

1, A milling machine having a bed, a table slidably mounted on said bed, a support on each side.

of the bed having guideways thereon the axis of said guideways lying in the same vertical'plane,

an overarm adjustably mounted in the guideway of each support and overhanging said table, one of said overarms having its overhanging portion offset with respect to said plane to permit overlap of the overarms.

2. In a milling machine having a column; and means therein to rotate a cutter arbor, an overarm for supporting the outboard end of said arbor comprising a guide section engaging the column, an arbor pendant supporting section formed on the overarm in spaced relation to the first section, and a member for connecting said sections including a portion lying in a plane parallel to the guide section and laterally displaced relative thereto.

3. A milling machine structure including a column, a support, an arbor carried thereby and projecting therefrom, an overarm structure carried by the column in overlying relation to the arbor and adjustable in a direction parallel with the axis thereof, said overarm structure having pendant guiding means thereon, pendant means depending from the overarm structure in ,theadirection of the arbor for adjustment relative to the overarm and arbor, said pendant means includand fixedly spaced surfaces for engaging said guiding means, and means for detachably securing the parts in arbor engaging position, whereby on disengagement thereof the arb'ormay be removed without removal of the pendant structure from the supporting overarm structure. o

4. A milling machine structure including a col: umn or support, an arbor removably mounted thereon and projecting therefrom, an overarm structure carried by the column and projecting above the arbor said overarm structure having spaced pendant guiding surfaces thereon, and pendant means carried by the overarm structure and extensible in the direction of the arbor for adjustment relative to the overarm and arbor, said pendant means including separable parts removably engageable with the arbor as between cutters mounted thereon and fixedly spaced complementary guide surfaces for engaging the guide surfaces on the overarm structure, whereby on separation of said parts the arbor may be removed from the column while maintaining contact between the'cooperative guide surfaces.

5. A milling machine having a bed, a table slidably mounted thereon, columns rising from the bed on opposite sides of the table, a cutter arbor projecting from each column in over-hanging relation with the table, said cutter arbors vertically overlapping one another, individual overarms for the arbors supported by their respective columns, one of said overarms having a portion laterally ofiset with respect to its longitudinal axis to permit vertical adjustment of one overarm past the other, and means on the ends of the overarms for supporting the respective cutter arbors.-

6, In a machine tool having a bed, a table reciprocably mounted on the bed, a vertical support projecting above the bed on each side of the table, a cutter spindle mounted in each support and lying in spaced relation in a vertical plane, a cutter arbor-projecting from each spindle, said arbors having cutters thereon lying in a vertical plane extending longitudinally of the table, an overarm mounted in each support, one of said overarms having a portion laterally offset with respect to the other overarm, and means carried by each overarm for supporting a bearing in alignment with the respective cutter arbor.

'7; In a machine tool having a horizontal slidable support, a column mounted on each side of said support, a vertically movable spindle carrier mounted on each column, each carrier having a rotatable spindle and an over-arm, all of said spindles and overarms lying in the same vertical plane, an offset formed in one of said over- LINCOLN E. MEHLHOPE. 

